We still haven't released 2.3.x on Amazon's store. The only additions since 2.0.4 are:- Support for multiple languages (German, French, etc.)- The ability to play online multiplayer (via Google Play Games) over 3G/4G. (This was previously wifi-only.) BUT, this wouldn't apply to the Amazon version since it doesn't support online play at all. (Gamecircle still doesn't support this and they don't want us to use Google Play Games to do the job.)

On the other hand, we've found the 2.3.x versions to be unstable on some devices and a little less performant. (This is due to a new version of the platform Osmos uses to work on Android.)

So... we haven't updated on Amazon yet since we're not sure it's worth the loss in device support and performance in exchange for adding extra language support. What do you think?

That said, if/when we get 2.3.x to behave better, we'll definitely update the version on Amazon's store.